VIVANCO-MACKIE, H.W. 2003.. Programa Integral de Mejoramiento de la Productividad Animal en el Perú. Rol del zootecnista en el desarrollo de la ganadería peruana. (Integral Program for the Improvement of Animal productivity in Peru. Roll of the Zootechnist in the Development of the Peruvian Livestock Industry). Primer Congreso Nacional de Estudiantes de Ingeniería Zootecnica. Huancayo Peru. (Proceedings First National Congress of Students of Zootechnical Engineering, Huancayo, Peru).

VIVANCO, H. W. 1988. Reproductive development to adulthood and some effects of breed and environment on the reproductive characteristics of rams in the Central Highlands of Peru. Dis. Res. PhD. Thesis. Utah State University, Logan, Utah, USA.

VIVANCO, H.W. 1983. Evaluation of the age, breed, month, period of the year and season influences on the reproductive capabilities of rams at the Peruvian Highlands. M.S. Thesis. California State Polytechnic University, Pomona, California, USA.

ALLISON, A.J.; ASPINAL, J.M.; EDWARDS, J.R.; LYNCH, P.R. and H.W. VIVANCO
1989. Sheep breeds exotic to New Zealand: Their performance and application to industry. Proc. 19th Sem. of the sheep and beef cattle Soc. of the New Zealand Vet. Ass. and 2nd
Int.Cong. for Sheep Vet. Palmerston North New Zealand.

VIVANCO, H.W.; CHAVEZ, C. and E. NOLTE. 1982. Artificial Insemination with frozen semen in goats in the north coast of Peru. Proc. 3rd International Conference on Goats Production and Disease. Tucson, Arizona. USA. 1982.